CVE-2026-63033 PUBLISHED

MZ Automation lib60870 Out-of-bounds Read

Assigner: icscert
Reserved: 16.07.2026 Published: 30.07.2026 Updated: 30.07.2026

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	MZ Automation
Product	lib60870
Versions	Default: unaffected Version 2.4.0 is affected Version 2.4.1 is unaffected

Solutions

MZ Automation recommends users update to version 2.4.1 when available. See MZ Automation advisory for more information: https://github.com/mz-automation/lib60870/security/advisories/GHSA-7v97-jmwv-w5j7

Credits

arun babu puthuparambil of Central Power Research Institute, Bengaluru, India reported this vulnerability to CISA. finder

References

Problem Types

CWE-125 CWE